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ice: fix software generating extra interrupts
The driver tried to work around missing completion events that occurred while interrupts are disabled, by triggering a software interrupt whenever we exit polling (but we had to have polled at least once). This was causing a *lot* of extra interrupts for some workloads like NVMe over TCP, which resulted in regressions in performance. It was also visible when polling didn't prevent interrupts when busy_poll was enabled. Fix the extra interrupts by utilizing our previously unused 3rd ITR (interrupt throttle) index and set it to 20K interrupts per second, and then trigger a software interrupt within that rate limit. While here, slightly refactor the code to avoid an overwrite of a local variable in the case of wb_en = true. Fixes: b7306b4 ("ice: manage interrupts during poll exit") Signed-off-by: Jesse Brandeburg <[email protected]> Tested-by: Gurucharan G <[email protected]> Signed-off-by: Tony Nguyen <[email protected]>
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